Yes, all services are free to use, restricted by usage duration only, which you can unlock for free by watching an ad or two.
Follow the link to the respective app store according to your device. We are currently offering JustVPN as an APP for iOS and Android.
If you have already downloaded the APP, run it, press connect and the magic happens.
Completely close the APP, reconnect to your WiFi and start the APP again. Wait 30 seconds and it should be available again.